<html>
<body>
<script type="text/javascript">
text="<bookstore>"
text=text+"<book>";
text=text+"<title>Harry Potter</title>";
text=text+"<author>J K. Rowling</author>";
text=text+"<year>2005</year>";
text=text+"</book>";
text=text+"</bookstore>";

try //Internet Explorer
  {
  xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
  xmlDoc.async="false";
  xmlDoc.loadXML(text);
  }
catch(e)
  {
  try //Firefox, Mozilla, Opera, etc.
    {
    parser=new DOMParser();
    xmlDoc=parser.parseFromString(text,"text/xml");

    // Jerry: get Title tag's value

    var titleCollection = xmlDoc.getElementsByTagName("title");
    for( var i = 0; i < titleCollection.length; i++){
      console.log(titleCollection[i].innerHTML);
    }
    }
  catch(e) {alert(e.message)}
  }
try 
  {
  document.write("xmlDoc 已加载，可以使用。");
  }
catch(e) {alert(e.message)}
</script>
</body>
</html>